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Vocabulary-Chemistry

Chemistry

Nothing is ever created or destroyed, only changed. Product always=reactants

Physical Change

A usually reversible change in the physical properties of a substance, as size or shape

Chemical Change

A usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance

Element

Substance that cannot be broken down into simpler substances

Chemical Formula

A representation of a substance using symbols for its constituent elements

Element (Diatomic) Molecule

Molecule composed only of two atoms, of either the same or different chemical elements

Compound Molecule

Two or more molecules

Chemical Equation

Shorthand form for writing what reactants are used and what products are formed in a chemical reaction; sometime shows whether energy is produced or absorbed

Chemical Reaction

Process that produces chemical change, resulting in new substances that have properties different from those of the original substances

Reactants (in a chemical equation)

Substance that exists before a chemical reaction begins

Products (in a chemical equation)

Substance that forms as a result of a chemical reaction

Coefficient (in a chemical equation)

A number that is constant for a given substance, body, or process under certain specified conditions, serving as a measure of one of its properties

Subscript (in a chemical equation)

Also called subfix. any character, number, or symbol written next to and slightly below another